It looks like that kit already has the larger rotors. Make sure it includes the front caliper relocator bracket. If not, you will need it. Depending on how much you are changing the rear sprocket you may need to alter the chain length. This will also throw off your speedometer.
Super easy to calibrate. Measure the circumference of the wheel in cm. Unplug 4 wire connector at the back of speedo. Scroll through menu to wheel size, and input measurement you took. Voila you are done! Make sure you keep noted of what the original number was in case you want to swap back!